EP0404656B1 - Mineral fine-pulverising method and pulveriser for carrying out this method - Google Patents

Mineral fine-pulverising method and pulveriser for carrying out this method Download PDF

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Publication number
EP0404656B1
EP0404656B1 EP90401708A EP90401708A EP0404656B1 EP 0404656 B1 EP0404656 B1 EP 0404656B1 EP 90401708 A EP90401708 A EP 90401708A EP 90401708 A EP90401708 A EP 90401708A EP 0404656 B1 EP0404656 B1 EP 0404656B1
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EP
European Patent Office
Prior art keywords
cheeks
roll
cylinders
roller
axes
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Revoked
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EP90401708A
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German (de)
French (fr)
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EP0404656A1 (en
Inventor
René Durinck
Philippe Lagache
Alain Cordonnier
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F C B
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F C B
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Priority claimed from FR8908165A external-priority patent/FR2648366B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity

Definitions

  • the present invention relates to a crusher for the fine grinding of minerals comprising two cylinders with horizontal and parallel axes, rotating in opposite directions and elastically pushed towards each other, and a dam placed below the plane containing the axes cylinders and closing down the space delimited by the cylinders below this plane and leaving a passage of reduced section for the output of the crushed products.
  • Such a crusher is the subject of the French patent application published under the number 2620635. It keeps the ground material under pressure in the space delimited by the cylinders immediately below the notional plane containing the axes of the cylinders. The counterpressure that the ground material exerts under the plane of the axes of the cylinders on the section of the layer of material compacted by passage between the cylinders, causes the decohesion of the particles by shearing effect, due to the anisotropy of the layer of material , and combats the formation of agglomerates.
  • the object of the present invention is to provide a cylinder mill in which the space between cylinders, below the plane of the axes of the cylinders, is better closed so that the counterpressure is exerted uniformly over the whole section of the slot between cylinders, and so as to prevent the circumferential and / or lateral fusing of the material when the latter contains a high percentage of fine particles, which is particularly the case when the ground product is recycled.
  • the mill object of the present invention is characterized in that one of the cylinders is provided at its ends with two annular cheeks situated on either side of the other cylinder, a short distance from the end faces of the latter , in that two fixed cheeks, located in the same planes as the annular cheeks and the edge of which follows with slight play the edge circular of the latter, extend downward from the plane of the axes of the cylinders to the level of the dam, and in that said dam is formed, at least in part, by a scraper bar placed in contact with the surface peripheral of the cylinder provided with the cheeks and the internal surface of these cheeks. The scraper bar will be pushed elastically towards the other cylinder.
  • the dam may be constituted by a scraper bar and by a roller whose axis is parallel to the axes of the cylinders, the bar and the roller being arranged side by side and the roller being elastically pushed towards the other. cylinder leaving a passage between them for the exit of the ground products.
  • the mill shown in the drawings consists essentially of two identical cylinders 10 and 12, with horizontal and parallel axes.
  • the bearings of cylinder 10 are fixed and the bearings of the other cylinder 12 are mounted on slides or pivoting arms to allow this cylinder to approach and move away from the first.
  • the cylinder 12 is pushed elastically towards the cylinder 10 by springs or by means of a hydro-pneumatic system.
  • the two cylinders are rotated at the same speed and in opposite directions.
  • the spacing between the cylinders 10 and 12 is maintained at a minimum value by stops.
  • the material to be ground is loaded above the cylinders in a feed chute 16, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, so that the cylinders are kept at a greater spacing by the layer of material which forms between them.
  • the grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between particles, so that the ground product contains a high proportion of fine particles.
  • the cylinder 10 is provided at its ends with annular cheeks 24 which frame the cylinder 12, a slight clearance being formed between the cheeks and the end faces of the cylinder 12.
  • These cheeks can be formed by machining in the mass of the cylinder or be attached to the cylinder and mechanically maintained thereon. They close at its two ends the space between the cylinders, above and below the plane X - X containing the axes of the cylinders, and at least in the zone of greatest pressure exerted on material through cylinders; the lateral closure of this space is completed downwards by fixed cheeks 30 which extend the lateral faces of the hopper 16 and are located in the plane of the cheeks 24, surrounding their outer edge with minimum play.
  • This bar is mounted on a fixed support 28 so that its position relative to the cylinder 10 can be adjusted, in particular to compensate for wear.
  • a roller 14 of small diameter is placed under the cylinders, next to the bar 26. These two elements are shown uncut in FIG. 1.
  • the bearings of this roller are supported by two arms 18 which can pivot around a parallel axis to the axes of the cylinders, so that, in all working conditions, the roller can assume an equilibrium position relative to the cylinder 12 by being pushed towards the latter by an elastic device such as springs 20.
  • the shape of the cross section of the bar 26 is chosen so that, in all the working positions of the roller 14, the distance between the latter and the adjacent face of the bar remains small and substantially constant.
  • the position of the articulation axis of the arms 18 is adjustable to compensate for the wear of the roller 14 and bar 26.
  • the space delimited under the plane X - X by the cylinders 10 and 12, the cheeks 24 and 30, the bar 26 and the roller 14 opens out onto the outside only through the slot formed between the cylinder 12 and the roller 14, and it is possible to maintain the ground material under pressure in this space, by controlling the force exerted by the springs 20, so that the ground product contains practically no agglomerates.
  • the counterpressure of the outgoing crushed material is exerted on the section of the layer at the air gap (slot between the cylinders in the plane X - X) and causes its decohesion as it progresses.
  • the device of the invention also has an anti-fusing role of the material when it contains particles whose dimensions are very much less than the spacing between cylinders in the plane X - X, that is to say that 'it prevents these fine particles from moving in the material layer at a speed greater than the peripheral speed of the cylinders or escaping laterally, without being subjected to grinding forces. These conditions are encountered in particular when the ground product is recycled, possibly after passing through a classification apparatus to separate the finest particles.
  • the crusher of the figure differs essentially from that shown in FIGS. 1 and 2 by the fact that the bar 26 - roller 14 assembly has been replaced by a bar 32 of suitable shape and dimensions, this bar being mounted in the same way as the roller 14 on oscillating arms 18 biased by springs 20 and also serving as a scraper for the cylinder 10.
  • the cheeks 24 could be eliminated and the space delimited by the cylinders under the plane of their axes could be closed laterally only by fixed cheeks arranged parallel to the end faces of the cylinders 10 and 12, at short distance of these.
  • One could also close said space at one of its ends by a cheek secured to one of the cylinders and at its end by another cheek secured to the other cylinder.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)

Description

La présente invention a pour objet un broyeur pour le broyage fin des minéraux comportant deux cylindres à axes horizontaux et parallèles, tournant en sens inverses et poussés élastiquement l'un vers l'autre, et un barrage placé au-dessous du plan contenant les axes des cylindres et fermant vers le bas l'espace délimité par les cylindres au-dessous de ce plan et laissant subsister un passage de section réduite pour la sortie des produits broyés.The present invention relates to a crusher for the fine grinding of minerals comprising two cylinders with horizontal and parallel axes, rotating in opposite directions and elastically pushed towards each other, and a dam placed below the plane containing the axes cylinders and closing down the space delimited by the cylinders below this plane and leaving a passage of reduced section for the output of the crushed products.

Un tel broyeur fait l'objet de la demande de brevet français publiée sous le n° 2620635. Il permet de maintenir la matière broyée en pression dans l'espace délimité par les cylindres immédiatement au-dessous du plan fictif contenant les axes des cylindres. La contrepression que la matière broyée exerce sous le plan des axes des cylindres sur la section de la couche de matière compactée par passage entre les cylindres, provoque la décohésion des particules par effet de cisaillement, en raison de l'anisotropie de la couche de matière, et combat la formation d'agglomérats.Such a crusher is the subject of the French patent application published under the number 2620635. It keeps the ground material under pressure in the space delimited by the cylinders immediately below the notional plane containing the axes of the cylinders. The counterpressure that the ground material exerts under the plane of the axes of the cylinders on the section of the layer of material compacted by passage between the cylinders, causes the decohesion of the particles by shearing effect, due to the anisotropy of the layer of material , and combats the formation of agglomerates.

Dans le brevet français n° 460333, relatif à la mouture des gruaux, on a proposé de créer une contrepression s'opposant à la poussée de la matière sortant des cylindres en plaçant entre les cylindres, du côté de la sortie, une trémie fermée par un volet soumis à la force d'un ressort ou d'un contrepoids.In French patent n ° 460333, relating to the grinding of groats, it has been proposed to create a counterpressure opposing the thrust of the material leaving the cylinders by placing between the cylinders, on the outlet side, a hopper closed by a shutter subjected to the force of a spring or a counterweight.

Les solutions décrites dans les documents précités ne permettent pas d'assurer une fermeture correcte de l'espace entre cylindres, au-dessous du plan des axes des cylindres, notamment à ses extrémités.The solutions described in the aforementioned documents do not make it possible to ensure correct closure of the space between cylinders, below the plane of the axes of the cylinders, in particular at its ends.

On connaît par ailleurs (DE.C.457037) un broyeur dont les cylindres comportent des joues qui ferment l'espace entre cylindres, à ses extrémités. Ces joues remplacent les joues fixes habituellement utilisées pour empêcher la matière à broyer de s'échapper latéralement, aux extrémités des cylindres.We also know (DE.C.457037) a crusher whose cylinders have cheeks which close the space between cylinders at its ends. These cheeks replace the fixed cheeks usually used to prevent the material to be ground from escaping laterally, at the ends of the cylinders.

Le but de la présente invention est de fournir un broyeur à cylindres dans lequel l'espace entre cylindres, au-dessous du plan des axes des cylindres, est mieux fermé de façon à ce que la contrepression s'exerce de manière uniforme sur toute la section de la fente entre cylindres, et de façon à empêcher le fusage circonférentiel et/ou latéral de la matière lorsque celle-ci contient un pourcentage élevé de fines particules, ce qui est notamment le cas lorsque le produit broyé est recyclé.The object of the present invention is to provide a cylinder mill in which the space between cylinders, below the plane of the axes of the cylinders, is better closed so that the counterpressure is exerted uniformly over the whole section of the slot between cylinders, and so as to prevent the circumferential and / or lateral fusing of the material when the latter contains a high percentage of fine particles, which is particularly the case when the ground product is recycled.

Le broyeur objet de la présente invention est caractérisé en ce que l'un des cylindres est muni à ses extrémités de deux joues annulaires situées de part et d'autre de l'autre cylindre, à faible distance des faces d'extrémité de ce dernier, en ce que deux joues fixes, situées dans les mêmes plans que les joues annulaires et dont le bord suit avec un faible jeu le bord circulaire de ces dernières, s'étendent vers le bas depuis le plan des axes des cylindres jusqu'au niveau du barrage, et en ce que ledit barrage est constitué, au moins en partie, par une barre de raclage placée au contact de la surface périphérique du cylindre muni des joues et de la surface intérieur de ces joues. La barre de raclage sera poussée élastiquement vers l'autre cylindre. En variante, le barrage pourra être constitué par une barre de raclage et par un rouleau dont l'axe est parallèle aux axes des cylindres, la barre et le rouleau étant disposés côte-à-côte et le rouleau étant poussé élastiquement vers l'autre cylindre en laissant subsister entre eux un passage pour la sortie des produits broyés.The mill object of the present invention is characterized in that one of the cylinders is provided at its ends with two annular cheeks situated on either side of the other cylinder, a short distance from the end faces of the latter , in that two fixed cheeks, located in the same planes as the annular cheeks and the edge of which follows with slight play the edge circular of the latter, extend downward from the plane of the axes of the cylinders to the level of the dam, and in that said dam is formed, at least in part, by a scraper bar placed in contact with the surface peripheral of the cylinder provided with the cheeks and the internal surface of these cheeks. The scraper bar will be pushed elastically towards the other cylinder. Alternatively, the dam may be constituted by a scraper bar and by a roller whose axis is parallel to the axes of the cylinders, the bar and the roller being arranged side by side and the roller being elastically pushed towards the other. cylinder leaving a passage between them for the exit of the ground products.

Les caractéristiques de l'invention apparaîtront plus clairement à la lecture de la description qui suit et se réfère aux dessins l'accompagnant qui montrent, à titre d'exemple non limitatif, deux formes de réalisation de l'invention et sur lesquels :

  • La figure 1 est une vue en coupe transversale d'un broyeur à cylindres conforme à l'invention;
  • Les figures 1 A et 1 B sont des coupes suivant X - X et A - A, respectivement;
  • La figure 2 est une vue de côté du broyeur; et
  • La figure 3 est une vue en coupe transversale illustrant une variante.
The characteristics of the invention will appear more clearly on reading the description which follows and refers to the accompanying drawings which show, by way of nonlimiting example, two embodiments of the invention and in which:
  • Figure 1 is a cross-sectional view of a roller mill according to the invention;
  • Figures 1 A and 1 B are sections along X - X and A - A, respectively;
  • Figure 2 is a side view of the mill; and
  • Figure 3 is a cross-sectional view illustrating a variant.

Le broyeur représenté sur les dessins est constitué essentiellement par deux cylindres identiques 10 et 12, à axes horizontaux et parallèles. Les paliers du cylindre 10 sont fixes et les paliers de l'autre cylindre 12 sont montés sur des glissières ou des bras pivotants pour permettre à ce cylindre de se rapprocher et de s'écarter du premier. Le cylindre 12 est poussé élastiquement vers le cylindre 10 par des ressorts ou au moyen d'un système hydro-pneumatique. Les deux cylindres sont entraînés en rotation à la même vitesse et en sens inverses.The mill shown in the drawings consists essentially of two identical cylinders 10 and 12, with horizontal and parallel axes. The bearings of cylinder 10 are fixed and the bearings of the other cylinder 12 are mounted on slides or pivoting arms to allow this cylinder to approach and move away from the first. The cylinder 12 is pushed elastically towards the cylinder 10 by springs or by means of a hydro-pneumatic system. The two cylinders are rotated at the same speed and in opposite directions.

Au repos, l'écartement entre les cylindres 10 et 12 est maintenu à une valeur minimale par des butées. En marche, la matière à broyer est mise en charge au-dessus des cylindres dans une goulotte d'alimentation 16, et le débit d'alimentation est nettement supérieur au débit correspondant à l'écartement minimal, de sorte que les cylindres sont maintenus à un écartement supérieur par la couche de matière qui se forme entre eux. Au sein de cette couche, le broyage est réalisé non seulement par écrasement, sous l'action de la pression exercée par les cylindres, mais aussi par attrition entre particules, de sorte que le produit broyé contient une forte proportion de fines particules.At rest, the spacing between the cylinders 10 and 12 is maintained at a minimum value by stops. In operation, the material to be ground is loaded above the cylinders in a feed chute 16, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, so that the cylinders are kept at a greater spacing by the layer of material which forms between them. Within this layer, the grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between particles, so that the ground product contains a high proportion of fine particles.

Le cylindre 10 est muni à ses extrémités de joues annulaires 24 qui encadrent le cylindre 12, un faible jeu étant ménagé entre les joues et les faces d'extrémité du cylindre 12. Ces joues peuvent être formées par usinage dans la masse du cylindre ou être rapportées sur le cylindre et maintenues mécaniquement sur celui-ci. Elles ferment à ses deux extrémités l'espace entre les cylindres, au-dessus et au-dessous du plan X - X contenant les axes des cylindres, et au moins dans la zone de plus forte pression exercée sur la matière par les cylindres; la fermeture latérale de cet espace est complétée vers le bas par des joues fixes 30 qui prolongent les faces latérales de la trémie 16 et sont situées dans le plan des joues 24 en entourant leur bord extérieur avec un jeu minimum.The cylinder 10 is provided at its ends with annular cheeks 24 which frame the cylinder 12, a slight clearance being formed between the cheeks and the end faces of the cylinder 12. These cheeks can be formed by machining in the mass of the cylinder or be attached to the cylinder and mechanically maintained thereon. They close at its two ends the space between the cylinders, above and below the plane X - X containing the axes of the cylinders, and at least in the zone of greatest pressure exerted on material through cylinders; the lateral closure of this space is completed downwards by fixed cheeks 30 which extend the lateral faces of the hopper 16 and are located in the plane of the cheeks 24, surrounding their outer edge with minimum play.

Une barre 26 placée au contact de la surface périphérique du cylindre 10, le long d'une génératrice, et de la surface intérieure des joues 24, ou à très faible distance de ces surfaces, assure le nettoyage du cylindre et des joues. Cette barre est montée sur un support fixe 28 de telle sorte que sa position par rapport au cylindre 10 puisse être ajustée, en particulier pour compenser l'usure.A bar 26 placed in contact with the peripheral surface of the cylinder 10, along a generator, and the inner surface of the cheeks 24, or at very short distance from these surfaces, ensures the cleaning of the cylinder and the cheeks. This bar is mounted on a fixed support 28 so that its position relative to the cylinder 10 can be adjusted, in particular to compensate for wear.

Un rouleau 14 de petit diamètre est placé sous les cylindres, à côté de la barre 26. Ces deux éléments sont représentés non coupés sur la figure 1. Les paliers de ce rouleau sont supportés par deux bras 18 pouvant pivoter autour d'un axe parallèle aux axes des cylindres, de manière à ce que, dans toutes les conditions de travail, le rouleau puisse prendre une position d'équilibre par rapport au cylindre 12 en étant poussé vers celui-ci par un dispositif élastique tel que des ressorts 20. La forme de la section droite de la barre 26 est choisie pour que, dans toutes les positions de travail du rouleau 14, la distance entre celui-ci et la face ajacente de la barre reste faible et sensiblement constante. La position de l'axe d'articulation des bras 18 est réglable pour compenser l'usure du rouleau 14 et de la barre 26.A roller 14 of small diameter is placed under the cylinders, next to the bar 26. These two elements are shown uncut in FIG. 1. The bearings of this roller are supported by two arms 18 which can pivot around a parallel axis to the axes of the cylinders, so that, in all working conditions, the roller can assume an equilibrium position relative to the cylinder 12 by being pushed towards the latter by an elastic device such as springs 20. The shape of the cross section of the bar 26 is chosen so that, in all the working positions of the roller 14, the distance between the latter and the adjacent face of the bar remains small and substantially constant. The position of the articulation axis of the arms 18 is adjustable to compensate for the wear of the roller 14 and bar 26.

L'espace délimité sous le plan X - X par les cylindres 10 et 12, les joues 24 et 30, la barre 26 et le rouleau 14 ne débouche sur l'extérieur que par la fente ménagée entre le cylindre 12 et le rouleau 14, et il est possible de maintenir la matière broyée en pression dans cet espace, en contrôlant l'effort exercé par les ressorts 20, de telle sorte que le produit broyé ne contiennent pratiquement pas d'agglomérats. La contrepression de la matière broyée sortante s'exerce sur la section de la couche au niveau de l'entrefer (fente entre les cylindres dans le plan X - X) et provoque sa décohésion au fur et à mesure de son avancement.The space delimited under the plane X - X by the cylinders 10 and 12, the cheeks 24 and 30, the bar 26 and the roller 14 opens out onto the outside only through the slot formed between the cylinder 12 and the roller 14, and it is possible to maintain the ground material under pressure in this space, by controlling the force exerted by the springs 20, so that the ground product contains practically no agglomerates. The counterpressure of the outgoing crushed material is exerted on the section of the layer at the air gap (slot between the cylinders in the plane X - X) and causes its decohesion as it progresses.

Le dispositif de l'invention a aussi un rôle anti-fusage de la matière lorsqu'elle contient des particules dont les dimensions sont très nettement inférieures à l'écartement entre cylindres dans le plan X - X, c'est-à-dire qu'il évite que ces fines particules ne se déplacent dans la couche de matière à une vitesse supérieure à la vitesse périphérique des cylindres ou s'échappent latéralement, sans être soumises à des efforts de broyage. Ces conditions se rencontrent en particulier lorsque le produit broyé est recyclé, éventuellement après passage dans un appareil de classification pour séparer les particules les plus fines.The device of the invention also has an anti-fusing role of the material when it contains particles whose dimensions are very much less than the spacing between cylinders in the plane X - X, that is to say that 'it prevents these fine particles from moving in the material layer at a speed greater than the peripheral speed of the cylinders or escaping laterally, without being subjected to grinding forces. These conditions are encountered in particular when the ground product is recycled, possibly after passing through a classification apparatus to separate the finest particles.

Le broyeur de la figure se distingue essentiellement de celui représenté sur les figures 1 et 2 par le fait que l'ensemble barre 26 - rouleau 14 a été remplacé par une barre 32 de forme et de dimensions appropriées, cette barre étant montée de la même manière que le rouleau 14 sur des bras oscillants 18 sollicités par des ressorts 20 et servant également de racleur pour le cylindre 10.The crusher of the figure differs essentially from that shown in FIGS. 1 and 2 by the fact that the bar 26 - roller 14 assembly has been replaced by a bar 32 of suitable shape and dimensions, this bar being mounted in the same way as the roller 14 on oscillating arms 18 biased by springs 20 and also serving as a scraper for the cylinder 10.

Comme indiqué plus haut, les joues 24 pourraient être supprimées et l'espace délimité par les cylindres sous le plan de leurs axes pourrait être fermé latéralement uniquement par des joues fixes disposées parallèlement aux faces d'extrémité des cylindres 10 et 12, à faible distance de celles-ci. On pourrait aussi fermer ledit espace à l'une de ses extrémités par une joue solidaire de l'un des cylindres et à son extrémité par une autre joue solidaire de l'autre cylindre.As indicated above, the cheeks 24 could be eliminated and the space delimited by the cylinders under the plane of their axes could be closed laterally only by fixed cheeks arranged parallel to the end faces of the cylinders 10 and 12, at short distance of these. One could also close said space at one of its ends by a cheek secured to one of the cylinders and at its end by another cheek secured to the other cylinder.

Claims (4)

  1. Grinding mill for fine grinding of minerals, including two rolls (10, 12) with horizontal and parallel axes which rotate in opposite directions and are elastically pushed against each other, and a barrier arranged below the plane containing the roll axes which closes the bottom of the space delimited by the rolls under this plane while leaving a small cross-section passage for the outlet of the ground products, characterized in that one of the rolls (10) is fitted at its ends with annular cheeks (24) arranged on either side of the other roll at a short distance from the end faces of the latter, in that two stationary cheeks (30) arranged in the same planes as the annular cheeks and the edge of which follows the circular edge of the latter with a small clearance extend from the plane of the roll axes down to the level of the said barrier, and in that the said barrier is composed, at least partly, of a scraper bar (26, 32) brought into contact with the peripheral surface of the roll (10) fitted with the cheeks (24) and with the inner surface of these cheeks.
  2. Grinding mill according to claim 1, characterized in that the said barrier is composed of a scraper bar (26) and a roller (14) the axis of which is parallel to the roll axes, in that the bar and the roller are arranged side by side, and in that a passage is provided between the said roller and the other roll (12) for the outlet of the ground products.
  3. Grinding mill according to claim 1, characterized in that the scraper bar (32) is elastically pushed toward the other roll (12).
  4. Grinding mill according to claim 2, characterized in that the said roller (14) is elastically pushed toward the other roll (12).
EP90401708A 1989-06-20 1990-06-19 Mineral fine-pulverising method and pulveriser for carrying out this method Revoked EP0404656B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8908165 1989-06-20
FR8908165A FR2648366B2 (en) 1987-09-17 1989-06-20 PROCESS OF FINE GRINDING OF MINERALS AND CRUSHER FOR THE IMPLEMENTATION OF THIS PROCESS

Publications (2)

Publication Number Publication Date
EP0404656A1 EP0404656A1 (en) 1990-12-27
EP0404656B1 true EP0404656B1 (en) 1994-04-06

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EP90401708A Revoked EP0404656B1 (en) 1989-06-20 1990-06-19 Mineral fine-pulverising method and pulveriser for carrying out this method

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US (1) US5054701A (en)
EP (1) EP0404656B1 (en)
JP (1) JPH0332751A (en)
DE (1) DE69007870T2 (en)
ES (1) ES2051483T3 (en)

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ES2051483T3 (en) 1994-06-16
DE69007870D1 (en) 1994-05-11
DE69007870T2 (en) 1994-09-01
US5054701A (en) 1991-10-08
JPH0332751A (en) 1991-02-13
EP0404656A1 (en) 1990-12-27

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